'Hyporhachis' definitions:

Definition of 'Hyporhachis'

From: GCIDE

Hyporhachis \Hy`po*rha"chis\, n.; pl. Hyporhachides. [NL., fr. Gr. "ypo` beneath + ? spine.] (Zool.) The stem of an aftershaft or hypoptilum. [Written also hyporachis.] [1913 Webster]